The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

• A. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-1.png">
• B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-2.png">
• C. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-3.png">
• D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-4.png">